package day19;

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int a = in.nextInt();
            if(a == 0) {
                return;
            }
            int n = a % 3;
            int m = a / 3;
            int sum = 0;
            while(m != 0) {
                sum += m;
                m = n + m;
                n = m % 3;
                m = m / 3;
            }
            if(n == 2) {
                sum = sum +1;
            }
            System.out.println(sum);
        }
    }
}